Splitting string in javascript using RegEx

Question

Trying to use RegEx to split the following string:

"C=US,ST=NY,O=GOOGLE\, INC"

The intention is for O=GOOGLE\, INC to stay intact after splitting on comma.

The idea is to not split on commas that that are preceded by '\' or '\\' characters. — Zlatan Sadibasic
– Zlatan Sadibasic, Commented Oct 10, 2014 at 18:10
If you don't care about odd/even `\`, use that regex in split. — user557597
– user557597, Commented Oct 10, 2014 at 18:13

score 1 · Accepted Answer · 2014-10-10 18:46:33Z

1

If you can do without split, you can just use a regex like this that captures field data.
edit - Modified to match spurious escapes as well.

 #  /(?:^|,)((?:[^,\\]*(?:\\,|\\)?)+)(?:(?=,)|$)/

 (?: ^ | , )            # Leading comma or BOL
 (                      # (1 start), Field data
      (?:
           [^,\\]* 
           (?: \\, | \\ )?
      )+
 )                      # (1 end)
 (?:                    # Lookahead, comma or EOL
      (?= , )
   |  $ 
 )

Output >>

 **  Grp 0 -  ( pos 0 , len 4 ) 
C=US  
 **  Grp 1 -  ( pos 0 , len 4 ) 
C=US  

--------------

 **  Grp 0 -  ( pos 4 , len 6 ) 
,ST=NY  
 **  Grp 1 -  ( pos 5 , len 5 ) 
ST=NY  

--------------

 **  Grp 0 -  ( pos 10 , len 15 ) 
,O=GOOGLE\, INC  
 **  Grp 1 -  ( pos 11 , len 14 ) 
O=GOOGLE\, INC

edited Oct 10, 2014 at 18:46

answered Oct 10, 2014 at 18:32

user557597

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Comments

sifriday · Accepted Answer · 2014-10-10 18:38:49Z

0

Your data looks like it will be fairly reliably of the form:

foo=bar,spic=span,a=bob\,fred

ie, pairs of key=val data, with escaped commas in the data. So if the escaped commas are only in the data, then you can use a simple lookahead for the 'key=' as part of your regexp. Assuming the key is always in capitals, then this works:

s = "C=US,ST=NY,O=GOOGLE\, INC"
s.split(/,(?=[A-Z]*=)/)

ie, split on a comma if it is followed by some capitals and an equals.

This will give you

["C=US", "ST=NY", "O=GOOGLE, INC"]

edited Oct 10, 2014 at 18:38

answered Oct 10, 2014 at 18:33

sifriday

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